Dual Polarity Peak detector
Dual Polarity Peak detector
(OP)
Well, I've helped others in the forum here... this time I need some help..
Looking for circuits to use as a starting point in designing a positive and negative (bipolar) peak detector... Using a dual opamp (TLE2072, 10Mhz BW), ckt response to 500Khz is desired. Input will be from a prior stage opamp that can output pos or neg signals from a transducer. The pulse outputs are way too fast and we want the peaks and a waveform that is more of an envelope follower type so this stage will be followed by a 2nd order lowpass filter. This is to allow a much more reasonable A/D converter spec (lot slower A/D) and lower the noise floor.
Anyway looking for a single or dual opamp ckt using diodes and or transistors in support of the opamp that can feed a single R-C that is the peak detector output. Current crude uni-polar Pk detect ckt uses 0.047uF cap and a 16K resistor in shunt, cap charge is via a series 47 ohm resistor and the usual diode (1N4448) from the opamp output. Input voltages range from 0.05V to 5V pk. Power supply is +/-15Vdc.
Thanks in advance for any ckt references or URL's.
If any PDF's or scanned images, I can accept files under 25Mb via email attachements to: Rtracy77@aol.com
Looking for circuits to use as a starting point in designing a positive and negative (bipolar) peak detector... Using a dual opamp (TLE2072, 10Mhz BW), ckt response to 500Khz is desired. Input will be from a prior stage opamp that can output pos or neg signals from a transducer. The pulse outputs are way too fast and we want the peaks and a waveform that is more of an envelope follower type so this stage will be followed by a 2nd order lowpass filter. This is to allow a much more reasonable A/D converter spec (lot slower A/D) and lower the noise floor.
Anyway looking for a single or dual opamp ckt using diodes and or transistors in support of the opamp that can feed a single R-C that is the peak detector output. Current crude uni-polar Pk detect ckt uses 0.047uF cap and a 16K resistor in shunt, cap charge is via a series 47 ohm resistor and the usual diode (1N4448) from the opamp output. Input voltages range from 0.05V to 5V pk. Power supply is +/-15Vdc.
Thanks in advance for any ckt references or URL's.
If any PDF's or scanned images, I can accept files under 25Mb via email attachements to: Rtracy77@aol.com





RE: Dual Polarity Peak detector
Is it a single unit or mass product ? (How important is the cost ?)
<nbucska@pcperipherals.com>
RE: Dual Polarity Peak detector
http://www.designtest.com/wpapers.html
http://www.panametrics.com/div_ndt/pages/products/instrument/5607item.shtml
http://www-cdslab.ece.umn.edu/cdslab/research/prml.html
http://www.ibelings.com/n4ip/sskw/
etc. for more info
RE: Dual Polarity Peak detector
I hope this helps. The winning desing of the EDN magazine design ideas was a similiar device utilizing a bjt for peak detection. I'm pretty sure the device can detect pos and neg of a waveform, Amplitude Modulation, up to 5MHz. The issue was this months June 2001 bimonthly.
xray
RE: Dual Polarity Peak detector
here is a web page from EDN with a similiar device design, http://www.ednmag.com/reg/1994/051294/10di3.htm
later
RE: Dual Polarity Peak detector
I didn't find you ref to the "winner edn ideas for design" unless it was that UV meter ckt...
RE: Dual Polarity Peak detector
http://www.ednmag.com/reg/1994/112394/24di3.htm
for a non-opamp alternative